1-2 BE1-50/51B-218/-228 General Information 9252000995 Rev G
Advantages
BE1-50/51B-218 and BE1-50/51B-228 overcurrent relays have many advantages over other overcurrent
relays. The primary advantages are:
• Time characteristics are defined by equations and graphs
• Field selectable time characteristics
• Very low burden extends the linear range of the CTs
• Self powered from the sensed current
• Continuous automatic calibration
BE1-50/51B-218 and BE1-50/51B-228 overcurrent relays may be tested without removing the relay from
the case. Shorting contacts are provided for all current inputs when the connection plugs or relay chassis
is removed from the relay case.
SPECIFICATIONS
BE1-50/51B-218 and BE1-50/51B-228 electrical and physical specifications are listed in the following
paragraphs.
Current Sensing Input
BE1-50/51B-218
Continuous Current: 14 Aac
One Second Rating: 400 Aac
BE1-50/51B-228
Continuous Current: 2.8 Aac
One Second Rating: 80 Aac
Time Overcurrent (51) Element
Setting the TIME PICKUP control at the minimum pickup setting places the relay in the most sensitive
state and may be used as a safety setting.
BE1-50/51B-218 Pickup
Setting Range: 0.5 to 15.9 Aac
Setting Increment: 0.1 Aac
Accuracy: ±2%, ±25 milliamperes at or above 0.5 ampere setting
BE1-50/51B-228 Pickup
Setting Range: 0.1 to 3.18 Aac
Setting Increment: 0.02 Aac
Accuracy: ±2%, ±5 milliamperes at or above 0.1 ampere setting
Dropout
Dropout occurs at 95% of pickup value.
Timing Range
0.0 to 9.9 seconds in 0.1 second steps.
Timing Accuracy
The timing accuracy is the sum of ±1 cycle, ±2%. This accuracy applies to the range of 1.3 to 40 times tap
and is for a given measured multiple of tap. The measurement of the multiple of tap has an accuracy that
is the sum of ±2%, ±25 milliamperes for the BE1-50/51B-218 and ±2%, ±5 milliamperes for the BE1-
50/51B-228.
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